Emery wheel



Patented Nov. 17, 1925.

DANIEL FREDERICK MCGOVERN, OF MONTPELIER, VERMONT.

EMERY WHEEL.

Application filed July 22, 1924.

To all whom it may concern:

Be it known that I, DANIEL F. MoGovEnN, a citizen of the United States,residing at Montpelier, county of Washington, State of Vermont, haveinvented certain new and useful Improvements in Emery Wheels, of whichthe following is a specification.

This invention relates to emery wheels, and particularly to an emerywheel of the type wherein the working surface of the wheel consists ofsets of spaced curved flanges which work the abrasive against the stonein the polishing operation.

My invention contemplates a material increase in effectiveness of theabrasive distribution in a wheel of this type, and consists inundercutting the flanges themselves for a portion of their length toprovide therein abrasive leads into which a portion of the abrasive inthe channels may be lodged by centrifugal force. The abrasive soentrapped against the flanges is not only available for contact with thestone being polished, but is effectively confined against wastage, thusnot only increasing the cutting quality of the wheel but effecting aneconomy in abrasive as well. i

The construction and operation of my emery wheel together with aselected embodiment which has been found satisfactory in use and welladapted to the requirements of manufacture is described and shown in theaccompanying specification and drawings and the characteristic featuresof novelty are particularly pointed out in the appended claims.Throughout the specification and drawings like reference characters arecorrespondingly applied, and in the drawings:

Fig. 1 is a bottom face view of an offset emery wheel in accordance withmy invention, and

Fig. 2 is a fragmentary side elevation of one of the segmental flangesparticularly showing its abrasive lead.

I have indicated generally at 1 the disc or base plate of an offsetemery wheel of standard construction. The disc 1 has its Working face,in the illustrative form shown,

Serial No. 727,558.

arranged in the form of two opposite sets of spaced segmental flanges 2,the space between said flanges providing channels 3 for the feed of theabrasive.

.The center of the flange sets are offset laterally relative to eachother so that the flanges of one set are disposed opposite the channelsof the other set. This permits the abrasive to be distributedsubstantially uniformly throughout the radial channels, 3.

My invention consists in forming the flanges 2 with undercut abrasiveleads indicated generally at l, at their forward ends. These leads whichopen inwardly of the flange extend partly through the width of theflange, but terminate short of the outer edges. They may have anydesired configuration but preferably comprise a receiving portion 4 andare preferably inclined towards their rear ends as at 4:, so that theabrasive will work back and pass out along 4, under the rotative actionof the wheel when it is in use. 5

The leads may be of any desired length but, preferably extend for abouthalf the length of the flange. The leads may be of various shapesalthough as a matter of practice I have found that the inclined rear endof the lead is satisfactory in that it facilitates the movement of theabrasive to work back beneath the flange.

By my invention therefore the abrasive is brought in increasing amountunder the face of the flanges and the portion of it entrapped beneaththe flanges is not only exposed for direct contact with the stone beingpolished, but affords a steady supply in position of maximum efliciency.My invention therefore has the double effect of both increasing thecutting efficiency of the wheel and of effecting an economy in theabrasive used as well.

What I therefore claim and 'desire to secure by Letters Patent is:

1. An abrasive wheel having on its working face a plurality of spacedflanges, the space between said flanges constituting abrasive feedchannels, said flanges having an abrasive lead extending from theirforforward end towards the rear end of the flange and the outer portionof the flange edge being uncut and constituting with said undercut innerportion an abrasive lead opening inwardly into the feed channel includedby said flange.

In testimony whereof I aflix my signature.

DANIEL FREDERICK MOGOVERN.

